Articles

TRY OUR PRODUCTS RISK-FREE - 30 DAYS MONEY BACK WARRANTY - * USA ONLY

0

<nav role="navigation" class="site-navigation">
  <ul class="site-nav__items"><li class="site-nav__item site-nav--has-dropdown site-nav--has-border site-nav--has-dropdown-lg" >
        <a href="/collections/exam-room-essentials" class="site-nav__link" >Exam Room Essentials</a><div class="site-nav__dropdown text-left d-position-right" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-60"><li class="column col-p-100 col-auto" ><div class="row row-60"><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/refraction" class="site-nav__link-bold site-nav__link-bold">Refraction</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/autorefractors" class="site-nav__link">Autorefractors</a></li><li>
        <a href="/products/digital-practice" class="site-nav__link">Digital Practice</a></li><li>
        <a href="/products/telecare" class="site-nav__link">Tele Eye Care</a></li><li>
        <a href="/pages/visual-acuity" class="site-nav__link">Visual Acuity</a></li><li>
        <a href="/collections/refractors" class="site-nav__link">Refractors</a></li><li>
        <a href="/pages/lensmeters" class="site-nav__link">Lensmeters</a></li><li>
        <a href="/pages/trial-lenses-frames" class="site-nav__link">Trial Lenses & Frames</a></li></ul></li><li>
            <a href="/pages/furniture" class="site-nav__link-bold site-nav__link-bold">Furniture</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/stands" class="site-nav__link">Stands</a></li><li>
        <a href="/collections/chairs" class="site-nav__link">Chairs</a></li><li>
        <a href="/collections/refraction-units" class="site-nav__link">Refraction Units</a></li><li>
        <a href="/pages/tables" class="site-nav__link">Tables</a></li><li>
        <a href="/collections/accessories-furniture" class="site-nav__link">Accessories</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/slit-lamps" class="site-nav__link-bold site-nav__link-bold">Slit Lamps</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/imaging" class="site-nav__link">Imaging</a></li><li>
        <a href="/collections/conventional" class="site-nav__link">Conventional</a></li><li>
        <a href="/collections/tonometers-slitlamps" class="site-nav__link">Tonometers</a></li></ul></li><li>
            <a href="/collections/portable-equipments" class="site-nav__link-bold site-nav__link-bold">Portable</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/portable-autorefractors" class="site-nav__link">Autorefractors</a></li><li>
        <a href="/collections/portable-retinal-cameras" class="site-nav__link">Retinal Cameras</a></li><li>
        <a href="/collections/portable-slit-lamps" class="site-nav__link">Slit Lamps</a></li><li>
        <a href="/collections/portable-lensmeters" class="site-nav__link">Lensmeters</a></li><li>
        <a href="/collections/keratometer" class="site-nav__link">Keratometers</a></li><li>
        <a href="/collections/handheld-tonometers" class="site-nav__link">Tonometers</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/posteriorsegment" class="site-nav__link-bold site-nav__link-bold">Posterior Segment</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/bio" class="site-nav__link">BIO</a></li><li>
        <a href="/collections/ezer-lenses" class="site-nav__link">Lenses</a></li><li>
        <a href="/collections/accessories-posterior-segment" class="site-nav__link">Accesories</a></li></ul></li><li>
            <a href="/pages/handheld" class="site-nav__link-bold site-nav__link-bold">Handheld</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/ophthalmoscopes" class="site-nav__link">Ophthalmoscopes</a></li><li>
        <a href="/collections/retinoscopes" class="site-nav__link">Retinoscopes</a></li><li>
        <a href="/collections/otoscopes" class="site-nav__link">Otoscopes</a></li><li>
        <a href="/collections/sets" class="site-nav__link">Sets</a></li><li>
        <a href="/collections/handles" class="site-nav__link">Handles</a></li><li>
        <a href="/collections/chargers" class="site-nav__link">Chargers</a></li><li>
        <a href="/collections/wall-units" class="site-nav__link">Wall Units</a></li><li>
        <a href="/collections/transilluminators" class="site-nav__link">Transilluminators</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/diagnostic-aids" class="site-nav__link-bold site-nav__link-bold">Diagnostic Aids</a><ul class="drilldown submenu submenu-last"><li>
        <a href="https://usophthalmic.com/collections/prism" class="site-nav__link">Prism</a></li><li>
        <a href="https://usophthalmic.com/collections/retinoscopy" class="site-nav__link">Retinoscopy</a></li><li>
        <a href="https://usophthalmic.com/collections/ishihara" class="site-nav__link">Ishihara</a></li><li>
        <a href="https://usophthalmic.com/collections/occluders" class="site-nav__link">Occluders</a></li><li>
        <a href="https://usophthalmic.com/collections/cross-cylinder" class="site-nav__link">Cross Cylinder</a></li><li>
        <a href="https://usophthalmic.com/collections/trial-frames" class="site-nav__link">Trial Frames</a></li><li>
        <a href="https://usophthalmic.com/collections/accessories-1" class="site-nav__link">Accessories</a></li></ul></li></ul>
    </div></div></li></ul></div></div>
          </div></li><li class="site-nav__item site-nav--has-dropdown site-nav--has-border site-nav--has-dropdown-lg" >
        <a href="/collections/specialized-equipment" class="site-nav__link" >Specialized Equipment</a><div class="site-nav__dropdown text-left d-position-right" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-60"><li class="column col-p-100 col-auto" ><div class="row row-60"><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="https://usophthalmic.com/collections/dry-eye" class="site-nav__link-bold site-nav__link-bold">Dry Eye</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/products/onyx-full" class="site-nav__link">Onyx Full</a></li><li>
        <a href="https://usophthalmic.com/products/sapphireaplus" class="site-nav__link">Sapphire A+</a></li><li>
        <a href="https://usophthalmic.com/products/sapphirea" class="site-nav__link">Sapphire A</a></li><li>
        <a href="https://usophthalmic.com/products/sapphire" class="site-nav__link">Sapphire</a></li><li>
        <a href="/products/e-eye-irpl" class="site-nav__link">E-EYE IRPL</a></li><li>
        <a href="/products/activa" class="site-nav__link">Activa</a></li></ul></li><li>
            <a href="/pages/retinal-camera" class="site-nav__link-bold site-nav__link-bold">Retinal Cameras</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/retinal-cameras" class="site-nav__link">Retinal Cameras</a></li><li>
        <a href="/collections/lenses-retinal-cameras" class="site-nav__link">Lenses</a></li><li>
        <a href="/collections/accessories-retinal-cameras" class="site-nav__link">Accesories</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/tonometers" class="site-nav__link-bold site-nav__link-bold">Tonometers</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/non-contact" class="site-nav__link">Non-Contact</a></li><li>
        <a href="/collections/applanation" class="site-nav__link">Applanation</a></li><li>
        <a href="/collections/handheld-tonometers" class="site-nav__link">Handheld</a></li></ul></li><li>
            <a href="/collections/visual-field" class="site-nav__link-bold site-nav__link-bold">Visual Field</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/visual-field-desktop" class="site-nav__link">Desktop</a></li><li>
        <a href="/collections/visual-field-hand-held" class="site-nav__link">Handheld</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/collections/ultrasounds" class="site-nav__link-bold">Ultrasounds</a></li><li>
            <a href="/collections/oct" class="site-nav__link-bold">OCT</a></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/products/em-4000" class="site-nav__link-bold">Specular Microscope</a></li><li>
            <a href="/collections/biometer" class="site-nav__link-bold">Biometer</a></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/collections/topographer" class="site-nav__link-bold">Topographer</a></li></ul>
    </div></div></li></ul></div></div>
          </div></li><li class="site-nav__item site-nav--has-dropdown site-nav--has-border site-nav--has-dropdown-lg" >
        <a href="/collections/surgical" class="site-nav__link" >Surgical</a><div class="site-nav__dropdown text-left d-position-right" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-60"><li class="column col-p-100 col-auto" ><div class="row row-60"><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/collections/biometer" class="site-nav__link-bold">Biometer</a></li><li>
            <a href="/collections/stretchers" class="site-nav__link-bold">Stretchers</a></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/collections/stools" class="site-nav__link-bold">Stools</a></li><li>
            <a href="/pages/binocular-loupes" class="site-nav__link-bold site-nav__link-bold">Binocular Loupes</a><ul class="drilldown submenu submenu-last"><li>
        <a href="https://usophthalmic.com/collections/binocularloupes" class="site-nav__link">Binocular Loupes</a></li><li>
        <a href="https://usophthalmic.com/collections/binocular-loupes-with-illumination" class="site-nav__link">Binocular Loupes with Illumination</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/headlights" class="site-nav__link-bold site-nav__link-bold">Headlights</a><ul class="drilldown submenu submenu-last"><li>
        <a href="https://usophthalmic.com/collections/headlights" class="site-nav__link">Headlights</a></li><li>
        <a href="https://usophthalmic.com/collections/headlights-with-frame" class="site-nav__link">Headlights with Frame</a></li></ul></li><li>
            <a href="/collections/camera-surgical" class="site-nav__link-bold">Camera</a></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/collections/sterilization-surgical-instruments" class="site-nav__link-bold">Sterilization</a></li></ul>
    </div></div></li></ul></div></div>
          </div></li><li class="site-nav__item site-nav--has-dropdown site-nav--has-border site-nav--has-dropdown-lg" >
        <a href="/collections/optical" class="site-nav__link" >Optical</a><div class="site-nav__dropdown text-left d-position-right" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-60"><li class="column col-p-100 col-auto" ><div class="row row-60"><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/automatic-edgers" class="site-nav__link-bold site-nav__link-bold">Automatic Edgers</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/edgers" class="site-nav__link">Edgers</a></li><li>
        <a href="/collections/tracers" class="site-nav__link">Tracers</a></li><li>
        <a href="/collections/blockers" class="site-nav__link">Blockers</a></li><li>
        <a href="/collections/drillers" class="site-nav__link">Drillers</a></li><li>
        <a href="/collections/accessories-optical" class="site-nav__link">Accessories</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/finishing" class="site-nav__link-bold site-nav__link-bold">Finishing</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/autogroovers" class="site-nav__link">Autogroovers</a></li><li>
        <a href="/collections/lens-drilling" class="site-nav__link">Lens Drilling</a></li><li>
        <a href="/collections/autopolishers" class="site-nav__link">Autopolishers</a></li><li>
        <a href="/collections/manual-edgers" class="site-nav__link">Manual Edgers</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/lensmeters-optical" class="site-nav__link-bold site-nav__link-bold">Lensmeters</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/digital-lensmeters" class="site-nav__link">Digital Lensmeters</a></li><li>
        <a href="/collections/manual-lensmeters" class="site-nav__link">Manual Lensmeters</a></li><li>
        <a href="/collections/portable-lensmeters" class="site-nav__link">Portable Lensmeters</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/dispensing" class="site-nav__link-bold site-nav__link-bold">Dispensing</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/pupillometers" class="site-nav__link">Pupillometers</a></li><li>
        <a href="/collections/frame-heaters" class="site-nav__link">Frame Heaters</a></li><li>
        <a href="/collections/photochromic-lens-tester" class="site-nav__link">Photochromic Lens Tester</a></li><li>
        <a href="/collections/frame-cleaner" class="site-nav__link">Frame Cleaner</a></li></ul></li></ul>
    </div><div class="col-12 col-lg-2">
      <ul class="submenu"><li>
            <a href="/pages/hand-tools" class="site-nav__link-bold site-nav__link-bold">Hand Tools</a><ul class="drilldown submenu submenu-last"><li>
        <a href="/collections/screwdrivers" class="site-nav__link">Screwdrivers</a></li><li>
        <a href="/collections/wrenches" class="site-nav__link">Wrenches</a></li><li>
        <a href="/collections/pliers" class="site-nav__link">Pliers</a></li><li>
        <a href="/collections/tool-kits" class="site-nav__link">Tool Kits</a></li><li>
        <a href="/collections/benches-racks" class="site-nav__link">Benches & Racks</a></li><li>
        <a href="/collections/small-tools" class="site-nav__link">Small Tools</a></li><li>
        <a href="/collections/measurements" class="site-nav__link">Measurements</a></li><li>
        <a href="/collections/tweezers" class="site-nav__link">Tweezers</a></li><li>
        <a href="/collections/screws-pad-kits" class="site-nav__link">Screws & Pad Kits</a></li><li>
        <a href="/collections/storage-organizers" class="site-nav__link">Storage & Organizers</a></li><li>
        <a href="/collections/miscellaneous" class="site-nav__link">Miscellaneous</a></li><li>
        <a href="/collections/lab-supplies" class="site-nav__link">Lab Supplies</a></li></ul></li></ul>
    </div></div></li><li class="column col-p-100 col-auto" ><div class="row row-60"></div></li></ul></div></div>
          </div></li><li class="site-nav__item site-nav--has-dropdown site-nav--has-border" >
        <a href="/collections/current-offers" class="site-nav__link" >Special</a><div class="site-nav__dropdown text-left d-position-left" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-60"><li class="column col-p-100 col-auto" ><div class="row row-60"><div class="col-12 col-lg-12">
      <ul class="submenu"><li>
            <a href="/collections/clearance-open-box" class="site-nav__link-bold">Open Box</a></li><li>
            <a href="/collections/current-offers" class="site-nav__link-bold">Current Offers</a></li></ul>
    </div></div></li></ul></div></div>
          </div></li><li class="site-nav__item site-nav--has-border site-nav--has-dropdown-lg" >
        <a href="/blogs/articles" class="site-nav__link" >Blog</a></li><li class="site-nav__item site-nav--has-dropdown site-nav--has-border pull-right" >
        <a href="#" class="site-nav__link" >About US Ophthalmic</a><div class="site-nav__dropdown text-left d-position-left" style="width:'100%'">
            <div class="site-nav__dropdown-inner"  style=""><div class="clearfix"><ul class="row row-20"><li class="column col-p-100 col-auto" ><div class="row row-20"><div class="col-12 col-lg-12">
      <ul class="submenu"><li>
            <a href="/pages/a-team-by-your-side" class="site-nav__link-bold">A Team by Your Side</a></li><li>
            <a href="https://usophthalmic.com/pages/from-one-independent-owner-to-another" class="site-nav__link-bold">From Independent to Independent</a></li><li>
            <a href="https://usophthalmic.com/pages/about-us#ourstory" class="site-nav__link-bold">Our Story</a></li><li>
            <a href="https://usophthalmic.com/pages/about-us#ourteam" class="site-nav__link-bold">Our Team</a></li><li>
            <a href="https://usophthalmic.com/pages/about-us#contactus" class="site-nav__link-bold">Contact US</a></li><li>
            <a href="https://usophthalmic.com/pages/about-us#givingback" class="site-nav__link-bold">Giving Back</a></li><li>
            <a href="https://usophthalmic.com/pages/about-us#testimonials" class="site-nav__link-bold">Testimonials</a></li><li>
            <a href="#" class="site-nav__link-bold">-------------------------------------</a></li><li>
            <a href="https://usophthalmic.com/pages/resources#ourcatalogs" class="site-nav__link-bold">Our Catalogs</a></li><li>
            <a href="https://usophthalmic.com/pages/resources#virtualtours" class="site-nav__link-bold">Virtual Tours</a></li><li>
            <a href="https://usophthalmic.com/pages/resources#usomeeting" class="site-nav__link-bold">USO Meeting</a></li></ul>
    </div></div></li></ul></div></div>
          </div></li></ul>
</nav>

Cart0

What Is a Keratometer? K Readings, K1/K2 and How to Choose One